<?php

namespace app\api\business;

use app\BaseController;
use Firebase\JWT\ExpiredException;
use Firebase\JWT\JWT as JWTUtil;

class Jwt extends BaseController
{
    /**
     * 根据json web token设置的规则生成token
     * @return \think\response\Json
     */
    public static function createjwt($id)
    {
        $key = md5('pyg'); //jwt的签发密钥，验证token的时候需要用到
        $time = time(); //签发时间
        $expire = $time + 14400; //过期时间
        $token = array(
            "user_id" => $id,
            "iss" => "http://www.pyg.com/",//签发组织
            "aud" => "thinkphp", //签发作者
            "iat" => $time,
            "nbf" => $time,
            "exp" => $expire
        );
        $jwt = JWTUtil::encode($token, $key);
        return $jwt;
    }

    /**
     * 验证token
     * @return \think\response\Json
     */
    public static function verifyjwt($token)
    {

        $key = md5('pyg'); //jwt的签发密钥，验证token的时候需要用到
        try {
            $jwtAuth = json_encode(JWTUtil::decode($token, $key, array("HS256")));
            $authInfo = json_decode($jwtAuth, true);
            if (!$authInfo['user_id']) {
                return "用户不存在";
            }
            return $authInfo;
        } catch (ExpiredException $e) {
            return "token过期";
        } catch (\Exception $e) {
            return $e->getMessage();
        }

    }

//    从请求信息中获取token令牌
    public static function getRequestToken()
    {
        if (empty($_SERVER['HTTP_AUTHORIZATION'])) {
            return false;
        }
        $header = $_SERVER['HTTP_AUTHORIZATION'];
        $method = 'bearer';
        //去除token中可能存在的bearer标识
        return trim(str_ireplace($method, '', $header));
    }

}
